Amazon.com: Plastic Guitar Stomp Knob Pedal Knobs Protector Cap Pack of 10 (Transparent Black) : Musical Instruments
Amazon.com: GHOST FIRE Guitar Effect Pedal Footswitch Foot Nail Cap Pad Cover Aluminum Tools Parts Foot Switch Toppers Knob Accessories (Mixed color) : Musical Instruments
The Stompshield | Accessories for Effect Pedals
big pedal knobs you can turn with your feet - MOD WIGGLER